If you damage is only minor, I'd agree with dee06. You could go back to the accident scene and see did the road markings allow this man to overtake leading up to the box junction. If they did - then you haven't a leg to stand on - even tho one car waved you out, this other guy still had command of the road. If there was a solid white line, he shouldn't have been overtaking at all and would be responsible for your damage. Without decent witness testimony tho, it would be hard to prove.